This is a front end wobble. I have changed the tires and had the
complete front end rebuilt once. Still often get this uncontrollable
wobble/weave on the my FXSTS and my 1998 FLSS. Handle bars move right and lest 2 to three inches and gain movement to a uncontrollable if I can not excelerate beyond 40. Nothing seems to work except throttle. Brakes rear or frount cant stop it when it happens. Checked teh neck bearings seem to be OK it flops to the left (standing in frount of the bike) with no bind or Been to three HD shops and they can't find the problem.
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Try switching the wheels from left to right side and see if the wobble goes with it.
If not, look for a worn tie rod end or other suspension component.
If wobble goes to left side, look for bent rim.
problems like this are best discussed with an accredited bike shop who has experience with wheel wobbles
you have changed the front tire to radial but did you change the back tire at the same time as radials and cross ply ( bias ply) tires have different handling characteristics
the wobble may be like a lack of compatibility between case constructions and I am thinking this because you say that the problem goes when changing back to the bias ply
I had a chev truck do that once . It was the tires were out of balance. A friend of mine had to put stablizer shock on the steering tie rod to stop his. It looks like a long shock that mounts to the frame and the tie rod shaft. Good Luck
Haha the death wobble replace the steering dampner or shock on the lower tortion bar of the suspension with an heavy duty upgraded one. Not a difficult repair check the tortion bar bushing for play. But the death wobble is caused by the steering shock. Seen it a lot fixes it every time. Hope the info helps rate it please.
Springer models have a tendancy to ruin neck bearings. Get the front wheel off the ground and point staight ahead. Now move the handlebars slightly from side to side. If you feel a slight "catch" or if the front wheel stays straight without falling to the side then the neck bearings are shot. They are tapered roller bearings, like a wheel bearing. The outer race will have a depression you can feel with your thumbnail. Pack the new bearings with the grease made for that purpose. A couple of hints: When h-d first made this grease available, I laughed. Use it, it works. It was originally designed for helicopter rotors. To remove the outer races, you may have to weld a bead on the bearing surface. The pre-load adjustment is critical. Too loose and you will get a wobble. Too tight and you get a weave, which is worse. It is normal for a springer front end to fall off to the left even when the wheel is pointed somewhat to the right. This is a pretty big job, so if a shop is going to do it you may want to show this to them and ask if it makes sense to them, but please don't second guess them.
yes make sure your lug nuts are all tight and the wheels are seated properly on the hubs, if they are tight bring the car to a tire shop and have them balance the two front tires, this will tell you if you have a bent wheel please rate -jeff